Retinoscope, opthalmoscope, and the like.



No. 886,512. PATBNTED MAY 5, 1908. U. G. INSKEEP & E. & G. S. GOWLLAND. RETINOSGOPE, OPHTHALMOSOOPE, AND THE LIKE.

APPLICATION FILED JULY 17,1906.

Him

item, it may cii'riccwrt:

*wBe i't ljiirownithatwe, (nAnLics (lnAMnnns In KEEP,2L citizeniiof the United States, re- 1 siding-a t ()ttu'i'nWi'i-yin the State of ,lowa,

United States, and Eonnn'r (}()VLLAN1) and iinri esiSnrrinus 5( i6)WLLANl), subjects of Edward: r'llyh ng of Great Britain and irelaiii'l,iaridlresidingatitlorland ltoad, Croydon,

' inzthei county "of Surrey, I'Gngland, have iii- 11'9 vented certain new and uselul improvements 'in lt'etinosckipes, ()phthalnuiscopes, and the l 7-, )l whichtl-ie following is a specification. f lhis invei'ition relates to rctinoscopes, ophthalnioscopcs and the like, and it has for '15 its ubjects toipro'vide means whereby in the fme instrument the beam of light reflected horn: the mirror maybe in the form of either parallel, convergent or divergent rays, and

. wherebyalso anysone form of such rays may '20 lie-instantlychangedto'eitlier of the other lorins at will; further, to provide means, by the'useiol' which the reflected beam of light is more nea'rly circular in cross section and is more uniform than that obtainable with 2 5 soll luniinousinstruments heretofore conis'tri'u-led.

in broad-temps, the invention con'iprises li"il instrument in which one or both ol the lenses (or thesingle lens,'when only one is '30"i'ised ),-or the source of light is adjustable relatiwrly to the mirror; and in which also Itlie mirror iUTIliSliQtl with a diaphragm having an elliptical opening.

()ur improved instrument is of compact l'orm; andi'isone inwhich the amount ol" light carriedto the mirror is greater than --witlininstrunients of the sanie type as })rfiviously made. Jen-"The *inventionfmay be conveniently car- 40 fried out as shown-in theaccoinpanying drawings, wherein Figure 1. is a sectional elevation of an ophthalmoscope carrying two condensing lenses, the upper one of which is stationary,

while the"lowcr one-'is adjustable; Fig. 2 is a side elevation of such ophthalmoscope; lig. 311's 1a trout elevation otthe diaphragm and mirror; Fig. 4 is a sectional elevation of a retinoscope in which there is only one con- 0 densing lens, this being adjustable; and Fig,

-." 'is a si'cl'e clevation of such retinoscope,

Similar letters refer to similar parts throughout the several views. 7

Referring to the" drawings, 01s the usual tubular handle, on to which is screwed the its insitnnr, l oil or'runwii rows; 1 runs snrr iiius (ifowiigi i N,

fspecifiatioii 8r Letters Patent.

through the mirror.

THE trivial Application filed July 17, 1906. I Serial No. 328,639.

The casirw b in the exam )le hereshowncarries two condensing lenses, the upper one lbeing stationary and fixed in the top of said casing, while the lower one m is adjustable, and is carried in a ferrule n which is connected by a short stud n, passing through a slot 0 in the casing b, to an elongated plate 7) furnished with a knob p for operating the adjustable lens in. The ferrule is divided or split at a" and presses outwards against the casing/i in which it works friction-tight and thus n'iaintains itself in an position in which it maybe placed. The plate 73 is made as long as convenience will allow in order that it may prevent, as muchas possible, the light from the lamp 0 passing outwards through the slot 0. The broken lines in Fig. 1 indicate substantially the range through which the lens on may be moved. The diaphragm (see Fig. 3) has anelliptical opening as shown, so that, whensprung on to the inclined end of the hood c tor the purpose ol" maintaining the mirror in position, the light proceeding from the lamp c iinpinges upon an elliptical area of the mirror and is coi-isequently reflected in the form of a beam of light of circular, or approximately circular, cross-section. The mirror is furnished with an elliptical peep-open ng d which may be either an aperture through the mirror or a transparent portion of the} mirror andby the term peep-openingisnieant any means for enabling the light to pass The provision of adevice of this character of such a construction as to cause the reflection of the light in a beam circular in cross sectionis of the, greatest importance, since if the beam-is elliptical in cross. section, such as is of necessity the case when a circular mirror is employed, the operator is led to resume that astigmatism exists in the eye ol itlie patient, even though should be about 111; times the length of the minor axis, and for different inclinations of the mirror the major axis will obviously require to be of difi'erent lengths.

Figs. 4 and 5 show a modified form of the invention as applied, for example, to a retinoscope. In this form, we provide only one lens m, and it is carried in the split ferrule n so as to be adjustable in the same manner as the lens 771, Fig. 1. The broken lines in Fig. 4 indicate approximately its extreme upper and lower positions.

The relative adjustment of the condensing lens and lamp such as is obtained with the construction disclosed in Fig. 5 may beobtained in any other suitable manner as by the provision of a fixed lens and adjustable lamp, with the same results.

It is obvious that any suitable means for efi'ecting the adjustment of the condensing lenses, other than the particular construction described herein, may be employed. It will also be obvious that the elliptical refleeting surface of the mirror may be obtained in any suitable manner.

The various forms of our invention are not confined to the articular types of-instruments in which they are shown, but are applicable to any other type.

We claim:

1,. In a retinoscope, ophthalmoscope or the like, the combination of a mirror, a source of 'iight, a stationary condensing lens, and an adjustable condensing lens. 1

2. Ina retinoscope, oph halmoscope or the like, the combination with anangularly arranged mirror having an elliptical reflecting surface, ofa casing, and a condensing lens and a source oflight in said casing, said lens and source of light'being adjustable relatively to each other.

3. In a retinoscope, ophthalinoscope or the like, the combination of a mirror with a dia phragm having an elliptical aperture.

4. In a retinoscope, ophthalmoscope or the like, the combination of a mirror, a diaphragm having an elliptical aperture mounted upon said mirror, a source of light, a stationary condensing lens, and an adjustable condensing lens.

5. In a retinoscope, ophthalmoscope or the.

like, the. combination of a mirror, a diaphragm having an elliptical aperture mount.- ved upon said mirror, a source of light, and an adjustal'ile condensing lens.

- 6. In aretinoscope,ophthahnoscope or the like, the combination of a mirror, a sourcepi "light, a casing, astationary condensing lens in saidcasing, an adjustable condensing lens 111 said casing,"-means' for supporting and means of alteringthe position of. said ad ustable lens.

7. In a retinoscope, ophthalmosco e. .or-th'e like, the combination With an angu ar ranged mirror having an elliptical reflec surface, of a source of light and a condensing;

lens.

S. In aretinoscope, ophthalmoscope or the like, the combination of a mirror, a dia phragm having an elliptical aperture mounted upon said mirror, a casing, a stationary condensing lens in said casing, an adjustable condensing lens in said casing, means for supporting and means for altering the position of said adjustable lens.

9. In a retinoscope, ophthalmoscope or the like, the combination of a mirror, a diaphragm having an elliptical aperture mounted upon'said mirror, a casing, anadjustable condensing lens in said'casing, means for supporting and means for altering the position of said adjustable lens.

10. In a retinoscope, ophthalmoscope or the like, the combination with a source, of light, of a mirror provided with an elliptical reflecting surface.

11. In a retinoscope, o h'thalmoscope or the like, a mirror provide with an elliptical reflecting surface and having an elliptical peep opening. 7

12. In a retinoscope, ophthalmoscope or the like, a mirror having an elliptical peepopening.

13. In a retinoscope, ophthalmoscope or the like, a mirror having a peep-opening in combination with a diaphragm, having an elliptical aperture.

14. In a retinoscope, ophthalmoscope or 1 the like, the combination with a mirror and a source of light, of a plurality of condensing lenses, one of which is adjustable.

15. In. a retinoscope, ophthalmosco' e or the like, the combination of an angular y ar ranged mirror having an elliptical reflecting surface, of a casing, and a source of light in said casing. j

16. In a retinoscope, 'ophthalmoscope or the like, the combination with an angularly arranged mirror having an ellipticalreflecting surface and an elliptical peep opening, of a casing, and a source of light in said casing.

In testimony whereof we have signed our names to this specification 'in the presence of two subscribing Witnesses.

' CHARLES CHAMBERS INSKEEP. EGBEKT GOWLLANI). CHARLES SEPTIMUS GOWIJLAND.

W'itnesses as to Charles Chambers Inskeep:

CARRY INSKEEP, CnAs. CoNNELLY;

Witnesses as to Egbert Gowlland and Charles Septimus Gowlland:

HENRY K. SEMPKIN, CHARLEs F. TUCKER. 

